Players attempt to place a continuous connected path of bridges from one side of the board to the opposite side while blocking their opponent from doing the same. Contents: Plastic mold board with raised nubs to place the bridges on 40 bridges (20 Red, 20 Yellow) The rules include an advanced version in which the number of bridges allowed is decreased (Student - 12; Brain - 10; Genius - 8). Once all of a player's allotted bridges are used, they must continue playing by picking up and reusing pieces previously placed on the board. See also the Shannon Switching Game, a.k.a. Bird Cage